On Nov 26, 4:08 pm, Arnaud Delobelle <[EMAIL PROTECTED]> wrote: > tekion <[EMAIL PROTECTED]> writes: > > Hello, > > I am playing with class. Below is the code snippet: > > #!/usr/bin/python > > 2 > > 3 class test_class: > > 4 #import gzip > > 5 def __init__(self,file): > > 6 self.file = file > > 7 def open_file(self): > > 8 try: > > 9 print "file: %s" % self.file > > 10 self.xml_file = gzip.GzipFile(self.file,'r') > > 11 except: > > 12 print "an exception has occured" > > 13 for line in self.xml_file: > > 14 print "line: %s" % line > > 15 self.xml_file.close() > > 16 > > 17 > > 18 if __name__ == '__main__': > > 19 import gzip > > 20 import sys > > 21 t = test_class( sys.argv[1] ) > > 22 t.open_file() > > > My question are: > > 1. Why do I need to use "import gzip" on main section to get it the > > script to work? I would assume you need the import of gzip in the > > class section. > > This is how Python works. Here is the relevant extract from the > Reference Manual: > > A scope defines the visibility of a name within a block. If a local > variable is defined in a block, its scope includes that block. If > the definition occurs in a function block, the scope extends to any > blocks contained within the defining one, unless a contained block > introduces a different binding for the name. The scope of names > defined in a class block is limited to the class block; it does not > extend to the code blocks of methods – this includes generator > expressions since they are implemented using a function scope. > > (Quoted fromhttp://docs.python.org/reference/executionmodel.html) > > > 2. What is the proper way of using module in a class you are creating? > > import it into the global namespace of the module in which you are > defining your class. > > -- > Arnaud
That's funny...this same question was asked at 11:30 this morning see thread: http://groups.google.com/group/comp.lang.python/browse_thread/thread/a42bf1e9504c3c3f?hl=en# -- http://mail.python.org/mailman/listinfo/python-list
